CN103541942B - Be applicable to the bidirectional control valve of short-wall coal-winning machine height-adjusting system - Google Patents
Be applicable to the bidirectional control valve of short-wall coal-winning machine height-adjusting system Download PDFInfo
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- CN103541942B CN103541942B CN201310524907.3A CN201310524907A CN103541942B CN 103541942 B CN103541942 B CN 103541942B CN 201310524907 A CN201310524907 A CN 201310524907A CN 103541942 B CN103541942 B CN 103541942B
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Abstract
Present invention is disclosed a kind of bidirectional control valve being applicable to short-wall coal-winning machine height-adjusting system, comprise hydraulic check valve, one-way throttle valve, safety overflow valve and selector valve, described hydraulic check valve comprises piston and two Pilot operated check valves; Two-way locking and the safety overflow of oil cylinder can be realized.The swaying direction (counterclockwise up or down, clockwise up or down) that the present invention is different according to rocking arm, selector valve can be displaced downwardly to different working positions (left position or right position) in the effect of oil cylinder two cavity oil pressure pressure reduction, and control both sides oil circuit (oil-feed and oil return) is communicated with or disconnection with its homonymy one-way throttle valve.Particularly when the rocking arm bottom, define and use one-way throttle valve speed limit, the balanced loop of Pilot operated check valve locking, efficiently solves the jitter problem of double-swing rocking arm when different direction declines, improves the functional reliability of Shortwall mining machine hydraulic system.
Description
Technical field
The invention belongs to coal excavation apparatus technical field, relate to a kind of heightening system of coal mining machine, particularly relate to a kind of bidirectional control valve being applicable to short-wall coal-winning machine height-adjusting system.
Background technique
For meeting working face of coal seam high-yield and high-efficiency demand, adapt to wider mining height scope and supporting requirement, by strengthening installed power, mode such as transformation fuselage, rocking arm etc., has carried out reinforcement, renewal and seriation to short-wall coal-winning machine.Owing to increasing rocking arm and drum weight, cylinder efficient load becomes large, heightens in inspection at this unit, rocking arm when starting to occur declining, heightens the phenomenon of oil pipe shake.Due to shortwall and twin-roll longwall shearer heighten mode and principle is different, therefore, at this unit to high strength, high-power today strided forward, its corresponding hydraulic pressure is heightened technology and also need be tackled key problems, upgrade.
On double-ended shearer, commonly large chamber oil return connects the way of one-way throttle valve, enough large back pressure is set, in order to balanced load, if add one-way throttle valve simply at short-wall coal-winning machine either side; can system back pressure be formed when rocking arm declines; but; when rocking arm rises; system back pressure becomes again oil-feed resistance, adds the deadweight of upper rocker arm and cylinder, and oil cylinder oil inlet pressure will be excessive; even exceed the maximum set pressure 20MPa of relief valve, whole height-adjusting system cannot be run reliable and securely.
In addition, when oil cylinder load increases to certain numerical value, after exceeding the allowed band of maximum induction pressure (load acts on the pressure on oil cylinder piston) of this system, the problem that return oil pressure can not solve rocking arm shake is set by one-way throttle valve.Therefore, at present, my company's double-ended shearer generally have employed damp type hydraulic check valve, it and one-way throttle valve with the use of, existing effect solves jitter problem when rocking arm declines.But concerning short-wall coal-winning machine double-swing rocking arm, the piston diameter size at its adjust high cylinder two ends is identical, according to damp type hydraulic check valve, jitter phenomenon can be eliminated when rocking arm declines, but when rocking arm rises, because oil cylinder two ends piston diameter is identical, the resistance of a size when declining with rocking arm being produced in oil cylinder oil return side, causing system input pressure excessive.Therefore, these methods using for reference double-ended shearer are impracticable.
In addition, short-wall coal-winning machine height-adjusting system adopts single-pump system, and it controls oil pressure is provided by return oil pressure, if balance valve, according to the working principle of equilibrium valve, back pressure will certainly cause equilibrium valve cracking pressure too high, cause the working pressure of pump too high, affect functional reliability.
Therefore, for solve short-wall coal-winning machine heighten problem, a kind of brand-new control valve group must be proposed, can two-wayly steadily heighten, the working pressure of oil pump can be reduced again preferably.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of bidirectional control valve being applicable to short-wall coal-winning machine height-adjusting system, effectively can solve the problem of additional drag when shake and rising when bidirectional swinging rocking arm declines, compact structure, highly integrated, good stability.
For solving the problems of the technologies described above, the present invention adopts following technological scheme:
Be applicable to a bidirectional control valve for short-wall coal-winning machine height-adjusting system, described control valve comprises: hydraulic check valve, one-way throttle valve, safety overflow valve and selector valve, and described hydraulic check valve comprises piston and two Pilot operated check valves;
Bidirectional control valve, containing two groups of Pilot operated check valves, two groups of one-way throttle valves, two groups of safety overflow valves, is respectively the first Pilot operated check valve, the second Pilot operated check valve, the first one-way throttle valve, the second one-way throttle valve, the first safety overflow valve, the second safety overflow valve;
Selector valve is that 2 two-position three-way valves are in series, and has 6 work and cuts groove, is respectively first and cuts groove, second and cut groove, the 3rd and cut groove, the 4th and cut groove, the 5th and cut groove, the 6th and cut groove; 6 work of selector valve are cut groove and are arranged symmetrically, and whole valve component is two-part of symmetrical configuration, are responsible for the control of oil cylinder two chamber entry/exit oil circuit respectively;
First cuts groove communicates with the first one-way throttle valve oil outlet place; Second cuts groove communicates with the valve prosopyle of the first Pilot operated check valve; 3rd cuts groove communicates with the oil inlet and outlet P mouth of valve group and the valve prosopyle of the first one-way throttle valve; 4th cuts groove communicates with the second one-way throttle valve oil outlet place; 5th cuts groove communicates with the valve prosopyle of the second Pilot operated check valve; 6th cuts groove communicates with the oil inlet and outlet O mouth of valve group and the valve prosopyle of the second one-way throttle valve;
Selector valve is controlled by the change of oil cylinder two cavity oil pressure pressure reduction, and by the different operating position of selector valve, the connection of cutting between groove is different; When selector valve is in left position, first cuts groove and second cuts groove and communicates, and the 5th cuts groove and the 6th cuts groove and communicate; When selector valve is in right position, the 4th cuts groove and the 5th cuts groove and communicates, and second cuts groove and the 3rd cuts groove and communicate;
When rocking arm rises counterclockwise, selector valve is in left position, fluid is from the oil-feed of P mouth, enter the 3rd and cut groove, flow to the valve prosopyle of the first one-way throttle valve, overcome acting force of the spring, open poppet valve core, flow out from the first one-way throttle valve outlet, flow into first and cut groove, then cut groove through second, flow into hydraulic check valve, flow to external tapping A and enter oil cylinder; Oil cylinder oil return enters from B mouth, by hydraulic check valve, enters the 5th and cuts groove, cut the direct oil return of groove through the 6th;
When rocking arm rises clockwise, selector valve is in right position, fluid is from the oil-feed of O mouth, enter the 6th and cut groove, flow to the second one-way throttle valve valve prosopyle, overcome acting force of the spring, open poppet valve core, flow out from the second one-way throttle valve outlet, flow into the 4th and cut groove, then cut groove through the 5th, flow into hydraulic check valve, flow to external tapping B mouth and enter oil cylinder; Oil cylinder oil return enters from A mouth, by hydraulic check valve, enters second and cuts groove, cut the direct oil return of groove through the 3rd;
When rocking arm declines counterclockwise, selector valve is in right position, fluid enters the 3rd from P mouth and cuts groove, flows to second and cuts groove, through hydraulic check valve, flow to external tapping A mouth and enters oil cylinder; Oil cylinder oil return enters from B mouth, by hydraulic check valve, enters the 5th and cuts groove, flow to the 4th cut groove after, by throttle valve oil return;
When rocking arm declines clockwise, selector valve is in left position, fluid enters the 6th from O mouth and cuts groove, flows to the 5th and cuts groove, through hydraulic check valve, flow to external tapping B mouth and enters oil cylinder; Oil cylinder oil return enters from A mouth, by hydraulic check valve, enters second and cuts groove, flow to first cut groove after, by throttle valve oil return;
First safety overflow valve communicates with the outlet port of the first Pilot operated check valve, and this outlet communicates with oil cylinder two chamber again, when oil cylinder cavity pressure is too high, fluid generation overflow, and cut groove off-load by the 5th and repairing to opposite side loop;
Second safety overflow valve communicates with the outlet port of the second Pilot operated check valve, and this outlet communicates with oil cylinder two chamber again, when oil cylinder cavity pressure is too high, fluid generation overflow, and cut groove off-load by second and repairing to opposite side loop.
As a preferred embodiment of the present invention, described Pilot operated check valve comprises again valve seat, Returnning spring, spool, plug screw; The A mouth connecing oil cylinder is led in first Pilot operated check valve one end, and groove is cut in one end logical second, and the B mouth connecing oil cylinder is led in second Pilot operated check valve one end, and groove is cut in one end the logical 5th; Heighten in process, hydraulic check valve is opened all the time, input pressure P3 acts on piston, oil-feed lifting surface area is A4, return pressure P4 acts on piston, and oil return lifting surface area is A3, and oil-feed lifting surface area A4 is greater than oil return lifting surface area A3, bidirectional control valve is by area increased than A4/A3, and the power that oil return side is acted on piston is always less than oil-feed side;
Described selector valve mainly comprises cylindrical body, changeover valve core, Ge Laiquan, plug screw; Two ends, selector valve left and right cut groove T(T ') communicate with chamber, oil cylinder left and right respectively, promote cylindrical body and changeover valve core action by two cavity oil pressure; 6 work of selector valve are cut groove and are communicated with the oil inlet and outlet of hydraulic check valve, one-way throttle valve, valve group respectively;
2 one-way throttle valves are arranged symmetrically with in bidirectional control valve valve group, and one-way throttle valve comprises throttle valve lever, poppet valve core, check valve spring, plug screw, nut, and throttle valve lever and check valve spring load poppet valve core;
2 plug-in type safety overflow valves are arranged symmetrically with in bidirectional control valve valve group; When the load of oil cylinder either side is excessive, safety overflow valve opens overflow, and its fluid enters opposite side Pilot operated check valve loop, to the oil cylinder repairing in another chamber.
As a preferred embodiment of the present invention, the piston of described hydraulic check valve is two diameter structures, when hydraulic check valve being worked by the area ratio changing piston, its oil-feed side power acted on piston is greater than oil return side all the time and acts on power on piston, to eliminate hydraulic check valve piston job insecurity when rocking arm declines.
As a preferred embodiment of the present invention, described one-way throttle valve adopts direct dynamic structure, and its throttle valve lever and check valve spring load in poppet valve core; When oil-feed, one-way valve opens, oil-feed is unimpeded; When oil return, closed check valve, fluid passes through after producing throttling from the gap between adjustable lever and poppet valve core endoporus, and throttling size can pass through adjustable lever, and the length changing throttle orifice realizes.
As a preferred embodiment of the present invention, described selector valve is composed in series by two two-position three-way valves and is subject to the oil pressure cntrol in adjust high cylinder two chamber, and when rocking arm rises, its oil return does not affect by the throttling of one-way throttle valve; When rocking arm declines, its oil return forms balanced loop by throttle valve.
Beneficial effect of the present invention is: the bidirectional control valve being applicable to short-wall coal-winning machine height-adjusting system that the present invention proposes, and is integrated with hydraulic check valve, one-way throttle valve, safety overflow valve and selector valve, can realizes two-way locking and the safety overflow of oil cylinder.The swaying direction (counterclockwise up or down, clockwise up or down) that the present invention is different according to rocking arm, selector valve can be displaced downwardly to different working positions (left position or right position) in the effect of oil cylinder two cavity oil pressure pressure reduction, and control both sides oil circuit (oil-feed and oil return) is communicated with or disconnection with its homonymy one-way throttle valve.Particularly when the rocking arm bottom, define and use one-way throttle valve speed limit, the balanced loop of Pilot operated check valve locking, efficiently solves the jitter problem of double-swing rocking arm when different direction declines, improves the functional reliability of Shortwall mining machine hydraulic system.
The present invention provides certain back-pressure balance load by one-way throttle valve, hypervelocity decompression in oil cylinder oil return side when preventing rocking arm from declining.Effectively can solve hydraulic check valve spool when rocking arm declines by the two diameter structure of hydraulic check valve piston and frequently open and close problem; By the swaying direction that the liquid controlled reversing valve arrangement of two two-position three-way valve series connection can be different according to rocking arm, control both sides oil circuit (oil-feed and oil return) is communicated with or disconnection with its homonymy one-way throttle valve, realize steadily heightening of bidirectional swinging rocking arm, and the working pressure of effective reduction system.
Accompanying drawing explanation
Fig. 1 is " selector valve-hydraulic check valve " cross-sectional schematic of coal winning machine bidirectional control valve of the present invention.
Fig. 2 is " one-way throttle valve-selector valve " cross-sectional schematic of coal winning machine bidirectional control valve of the present invention.
Fig. 3 is " hydraulic check valve-safety valve " cross-sectional schematic of coal winning machine bidirectional control valve of the present invention.
Fig. 4 is the fundamental diagram of coal winning machine bidirectional control valve of the present invention.
Fig. 5 is the hydraulic check valve piston hydraulic control some work schematic diagram of coal winning machine bidirectional control valve of the present invention.
Accompanying drawing mark is as follows:
1. plug screw; 2. valve seat; 3. Returnning spring; 4. spool;
5. cylindrical body; 6. changeover valve core; 7. lattice enclose; 8. plug screw;
9. piston; 10. throttle valve lever; 11. poppet valve cores; 12. check valve springs; 13. plug screws; 14. nuts;
C(or C '): Pilot operated check valve; D(or D '): safety overflow valve;
K(or K '): one-way throttle valve
Embodiment
The preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing.
Embodiment one
Present invention is disclosed a kind of bidirectional control valve being applicable to short-wall coal-winning machine height-adjusting system, a valve block is highly integrated with hydraulic check valve, one-way throttle valve, safety valve and selector valve four kinds of functional structures.
Refer to Fig. 1, hydraulic check valve is by piston 9 and two Pilot operated check valves C, C ' form, and as shown in Figure 3, Pilot operated check valve comprises again valve seat 2, Returnning spring 3, spool 4, plug screw 1 etc.; Each Pilot operated check valve C(or C ') one end leads to oil cylinder and enters (or going out) mouth, one end way system enters (or going out) oil circuit.Heighten in process, hydraulic check valve is opened all the time, the hydraulic control structure of piston is see Fig. 5, input pressure P3 acts on piston, lifting surface area is A4, and return pressure P4 acts on (P2 very I ignores) on piston, and lifting surface area is A3, bidirectional control valve is by area increased ratio (A4/A3), and the power that oil return side is acted on piston is always less than oil-feed side.
Please continue to refer to Fig. 1, selector valve mainly comprises cylindrical body 5, changeover valve core 6, lattice enclose 7, plug screw 8 etc.Two ends, selector valve left and right cut groove T(or T ') communicate with chamber, oil cylinder left and right respectively, promote cylindrical body and changeover valve core action by two cavity oil pressure.6 work of selector valve are cut groove and are communicated with the oil inlet and outlet of hydraulic check valve, one-way throttle valve, valve group respectively.
Bidirectional control valve is containing two groups of Pilot operated check valves, two groups of one-way throttle valves, two groups of safety overflow valves, and 6 of selector valve work are cut groove and are arranged symmetrically, whole valve group can be divided into two-part of symmetrical configuration, is responsible for the control that (or going out) oil circuit is entered in oil cylinder two chamber respectively.
Selector valve is controlled by the change of oil cylinder two cavity oil pressure pressure reduction, and by the different operating position of selector valve, the connection of cutting between groove is different.When selector valve is in left position, cuts groove I and cut groove II and communicate, cut groove II ' and cut groove III ' and communicate; When selector valve is in right position, cuts groove I ' and cut groove II ' and communicate, cut groove II and cut groove III and communicate.
Selector valve is that 2 two-position three-way valves are in series, and has 6 work and cuts groove, cuts groove I and communicates with one-way throttle valve K oil outlet place; Cut groove II to communicate with the valve prosopyle of Pilot operated check valve C; Cut groove III to communicate with the oil inlet P of valve group and the valve prosopyle of one-way throttle valve K.Cut groove I ' to communicate with one-way throttle valve K ' oil outlet place; Cut groove II ' to communicate with the valve prosopyle of Pilot operated check valve C '; Cut groove III ' to communicate with the oil outlet O of valve group and the valve prosopyle of one-way throttle valve K '.
By selector valve action, cause each work cut between groove connection change, achieve system into and out of oil circuit move towards change.System oil-feed flows into and cuts groove III(or III ') after, according to the difference of selector valve working position, or flow to through one-way throttle valve and cut groove II(II '), also or directly flow to and cut groove II(II ') after, then the external tapping place of valve group connection oil cylinder is flow to by hydraulic check valve.Oil cylinder oil return by hydraulic check valve, flows into and cuts groove II(II ') after, according to the difference of selector valve working position, fluid or directly oil sump tank, also or flow to cut groove I(I ') oil sump tank after throttle valve.By selector valve work cut between groove connection change, when rocking arm rises, system into and out of oil circuit without additional drag; And throttle resistance is added on the oil circuit of rocking arm decline.
When oil cylinder side chamber pressure is too high, safety overflow valve generation overflow, and cut groove II(II ' by selector valve) connect, off-load is to opposite side loop.
Oil inlet and outlet P (O) is positioned at and cuts groove III(or III ') place, system enter (going out) fluid by cutting groove III(or III '), flow in loculus that hydraulic check valve piston and poppet valve core formed, participation controls piston action, to reduce when rocking arm declines oil return side to the active force of piston.
Particularly, when rocking arm rises counterclockwise, selector valve is in left position (or when rocking arm rises clockwise, selector valve is in right position), and fluid is from P (or O, during corresponding above-mentioned clockwise rising, lower same) mouth oil-feed, enter and cut groove III(or III '), flow to one-way throttle valve valve prosopyle, overcome acting force of the spring, open poppet valve core, flow out from one-way throttle valve outlet, groove I(I ' is cut in inflow), again through cutting groove II(II '), flow into hydraulic check valve, flow to external tapping A(or B) enter oil cylinder.Oil cylinder oil return is from B(or A) mouth enters, by hydraulic check valve, enters and cut groove II ' (II), through cutting groove III ' (III) directly oil return.
When rocking arm declines counterclockwise, selector valve is in right position (or when rocking arm declines clockwise, selector valve is in left position), fluid is from P (or O, during corresponding above-mentioned clockwise decline, lower same) enter and cut groove III(or III '), the flow direction cuts groove II(II '), through hydraulic check valve, flow to external tapping A(or B) enter oil cylinder.Oil cylinder oil return is from B(or A) mouth enters, by hydraulic check valve, enters and cut groove II ' (II), flows to after cutting groove I ' (I), by throttle valve oil return.
Safety overflow valve D(or D ') with Pilot operated check valve C(or C ') outlet port communicate, this outlet communicates with oil cylinder two chamber again, when oil cylinder cavity pressure is too high, fluid generation overflow, and by cut groove II ' (II) off-load and repairing to opposite side loop.
Refer to Fig. 2,2 one-way throttle valves are arranged symmetrically with in valve group, and comprise throttle valve lever 10, poppet valve core 11, check valve spring 12, plug screw 13, nut 14 etc., compact structure, throttle valve lever 10 and check valve spring 12 load poppet valve core 11.
Refer to Fig. 3,2 plug-in type safety overflow valves D, D ' be arranged symmetrically with in valve group.See Fig. 4, when the load of oil cylinder either side is excessive, safety overflow valve opens overflow, and its fluid enters opposite side Pilot operated check valve loop, can give the oil cylinder repairing in another chamber.
Short-wall coal-winning machine is a kind of single ended shearer of specific type, and its rocking arm is arranged in waist, adopts simple and reliable tooth bar-oil cylinder to drive rocking arm to swing within the scope of 310 °.The working principle of heightening of this coal machine employing bidirectional control valve can see Fig. 4.
When oil cylinder piston is in meta, rocking arm is (C position) vertically downward.Setting, first from left side oil-feed, is opened Pilot operated check valve, is entered the left chamber of oil cylinder, promote piston to low order end, by heightening wheel and rack engagement, by the straight line motion of piston, be converted into rotation motion, drive rocking arm counterclockwise to upper rotary, to upper limit on the right position (B position), in this process, the left cavity pressure of oil cylinder is greater than right cavity pressure, oil circuit control promotes selector valve to left position, and the direct oil return of right cavity of cylinder, without one-way throttle valve.
Operator hydraulicchange-over valve, from right side oil-feed, rocking arm is from the clockwise bottom in B position to C position, and in this process, because the left cavity pressure of oil cylinder is greater than right cavity pressure, selector valve is still in left position, the oil return after throttling of left chamber fluid.
Continue the oil-feed of right chamber, promote piston to high order end, rocking arm is put to A position clockwise from C position, and in this process, because right cavity of cylinder pressure is greater than left cavity pressure, oil circuit control promotes selector valve to right position, and the direct oil return in the left chamber of oil cylinder, without one-way throttle valve.
Operator hydraulicchange-over valve, from left side oil-feed, rocking arm is from the counterclockwise bottom in A position to C position, and in this process, because right cavity of cylinder pressure is greater than left cavity pressure, selector valve is still in right position, the oil return after throttling of left chamber fluid.So far, complete and wholely heighten process, achieve the swing within the scope of 310 °, rocking arm.
In sum, the bidirectional control valve being applicable to short-wall coal-winning machine height-adjusting system that the present invention proposes, is integrated with hydraulic check valve, one-way throttle valve, safety overflow valve and selector valve, can realizes two-way locking and the safety overflow of oil cylinder.The swaying direction (counterclockwise up or down, clockwise up or down) that the present invention is different according to rocking arm, selector valve can be displaced downwardly to different working positions (left position or right position) in the effect of oil cylinder two cavity oil pressure pressure reduction, and control both sides oil circuit (oil-feed and oil return) is communicated with or disconnection with its homonymy one-way throttle valve.Particularly when the rocking arm bottom, define and use one-way throttle valve speed limit, the balanced loop of Pilot operated check valve locking, efficiently solves the jitter problem of double-swing rocking arm when different direction declines, improves the functional reliability of Shortwall mining machine hydraulic system.And propose two diameter structures of two-way hydraulic check valve piston, and the one-way throttle valve of direct dynamic structure, and two two position three way directional control valve series connection hydraulic control structures.
Here description of the invention and application is illustrative, not wants by scope restriction of the present invention in the above-described embodiments.Distortion and the change of embodiment disclosed are here possible, are known for the replacement of embodiment those those of ordinary skill in the art and the various parts of equivalence.Those skilled in the art are noted that when not departing from spirit of the present invention or substantive characteristics, the present invention can in other forms, structure, layout, ratio, and to realize with other assembly, material and parts.When not departing from the scope of the invention and spirit, can other distortion be carried out here to disclosed embodiment and change.
Claims (5)
1. be applicable to a bidirectional control valve for short-wall coal-winning machine height-adjusting system, it is characterized in that, described control valve comprises: hydraulic check valve, one-way throttle valve, safety overflow valve and selector valve, and described hydraulic check valve comprises piston and two Pilot operated check valves;
Bidirectional control valve, containing two groups of Pilot operated check valves, two groups of one-way throttle valves, two groups of safety overflow valves, is respectively the first Pilot operated check valve, the second Pilot operated check valve, the first one-way throttle valve, the second one-way throttle valve, the first safety overflow valve, the second safety overflow valve;
Selector valve is that 2 two-position three-way valves are in series, and has 6 work and cuts groove, is respectively first and cuts groove, second and cut groove, the 3rd and cut groove, the 4th and cut groove, the 5th and cut groove, the 6th and cut groove; 6 work of selector valve are cut groove and are arranged symmetrically, and whole bidirectional control valve is divided into two-part of symmetrical configuration, are responsible for the control of oil cylinder two chamber entry/exit oil circuit respectively;
First cuts groove communicates with the first one-way throttle valve oil outlet place; Second cuts groove communicates with the valve prosopyle of the first Pilot operated check valve; 3rd cuts groove communicates with the oil inlet and outlet P mouth of bidirectional control valve and the valve prosopyle of the first one-way throttle valve; 4th cuts groove communicates with the second one-way throttle valve oil outlet place; 5th cuts groove communicates with the valve prosopyle of the second Pilot operated check valve; 6th cuts groove communicates with the oil inlet and outlet O mouth of bidirectional control valve and the valve prosopyle of the second one-way throttle valve;
Selector valve is controlled by the change of oil cylinder two cavity oil pressure pressure reduction, and by the different operating position of selector valve, the connection of cutting between groove is different; When selector valve is in left position, first cuts groove and second cuts groove and communicates, and the 5th cuts groove and the 6th cuts groove and communicate; When selector valve is in right position, the 4th cuts groove and the 5th cuts groove and communicates, and second cuts groove and the 3rd cuts groove and communicate;
When rocking arm rises counterclockwise, selector valve is in left position, fluid is from the oil inlet and outlet P mouth oil-feed of bidirectional control valve, enter the 3rd and cut groove, flow to the valve prosopyle of the first one-way throttle valve, overcome acting force of the spring, open poppet valve core, flow out from the first one-way throttle valve outlet, flow into first and cut groove, then cut groove through second, flow into hydraulic check valve, flow to external tapping A mouth and enter oil cylinder; Oil cylinder oil return enters from external tapping B mouth, by hydraulic check valve, enters the 5th and cuts groove, cut the direct oil return of groove through the 6th;
When rocking arm rises clockwise, selector valve is in right position, fluid is from the oil inlet and outlet O mouth oil-feed of bidirectional control valve, enter the 6th and cut groove, flow to the second one-way throttle valve valve prosopyle, overcome acting force of the spring, open poppet valve core, flow out from the second one-way throttle valve outlet, flow into the 4th and cut groove, then cut groove through the 5th, flow into hydraulic check valve, flow to external tapping B mouth and enter oil cylinder; Oil cylinder oil return enters from external tapping A mouth, by hydraulic check valve, enters second and cuts groove, cut the direct oil return of groove through the 3rd;
When rocking arm declines counterclockwise, selector valve is in right position, fluid enters the 3rd from the oil inlet and outlet P mouth of bidirectional control valve and cuts groove, flows to second and cuts groove, through hydraulic check valve, flow to external tapping A mouth and enters oil cylinder; Oil cylinder oil return enters from external tapping B mouth, by hydraulic check valve, enters the 5th and cuts groove, flow to the 4th cut groove after, by the second one-way throttle valve oil return;
When rocking arm declines clockwise, selector valve is in left position, fluid enters the 6th from the oil inlet and outlet O mouth of bidirectional control valve and cuts groove, flows to the 5th and cuts groove, through hydraulic check valve, flow to external tapping B mouth and enters oil cylinder; Oil cylinder oil return enters from external tapping A mouth, by hydraulic check valve, enters second and cuts groove, flow to first cut groove after, by the second one-way throttle valve oil return;
First safety overflow valve communicates with the outlet port of the first Pilot operated check valve, and this outlet communicates with oil cylinder two chamber again, when oil cylinder cavity pressure is too high, fluid generation overflow, and cut groove off-load by the 5th and repairing to opposite side loop;
Second safety overflow valve communicates with the outlet port of the second Pilot operated check valve, and this outlet communicates with oil cylinder two chamber again, when oil cylinder cavity pressure is too high, fluid generation overflow, and cut groove off-load by second and repairing to opposite side loop.
2. the bidirectional control valve being applicable to short-wall coal-winning machine height-adjusting system according to claim 1, is characterized in that:
Described Pilot operated check valve comprises again valve seat, Returnning spring, spool, plug screw; First Pilot operated check valve one end leads to the external tapping A mouth of oil cylinder, and groove is cut in one end logical second, and second Pilot operated check valve one end leads to the external tapping B mouth of oil cylinder, and groove is cut in one end the logical 5th; Heighten in process, hydraulic check valve is opened all the time, input pressure P3 acts on piston, oil-feed lifting surface area is A4, return pressure P4 acts on piston, and oil return lifting surface area is A3, and oil-feed lifting surface area A4 is greater than oil return lifting surface area A3, bidirectional control valve is by area increased than A4/A3, and the power that oil return side is acted on piston is always less than oil-feed side;
Described selector valve mainly comprises cylindrical body, changeover valve core, Ge Laiquan, plug screw; The groove T (T ') that cuts at two ends, selector valve left and right communicates with chamber, oil cylinder left and right respectively, promotes cylindrical body and changeover valve core action by two cavity oil pressure; 6 work of selector valve are cut groove and are communicated with the oil inlet and outlet of hydraulic check valve, one-way throttle valve, bidirectional control valve respectively;
2 one-way throttle valves are arranged symmetrically with in bidirectional control valve, and one-way throttle valve comprises throttle valve lever, poppet valve core, check valve spring, plug screw, nut, and throttle valve lever and check valve spring load poppet valve core;
2 plug-in type safety overflow valves are arranged symmetrically with in bidirectional control valve; When the load of oil cylinder either side is excessive, safety overflow valve opens overflow, and its fluid enters opposite side Pilot operated check valve loop, to the oil cylinder repairing in another chamber.
3. the bidirectional control valve being applicable to short-wall coal-winning machine height-adjusting system according to claim 2, is characterized in that:
The piston of described hydraulic check valve is two diameter structures, when hydraulic check valve being worked by the area ratio changing piston, its oil-feed side power acted on piston is greater than oil return side all the time and acts on power on piston, to eliminate hydraulic check valve piston job insecurity when rocking arm declines.
4. the bidirectional control valve being applicable to short-wall coal-winning machine height-adjusting system according to claim 2, is characterized in that:
Described one-way throttle valve adopts direct dynamic structure, and its throttle valve lever and check valve spring load in poppet valve core; When oil-feed, one-way valve opens, oil-feed is unimpeded; When oil return, closed check valve, fluid passes through after producing throttling from the gap between adjustable lever and poppet valve core endoporus, and throttling size can pass through adjustable lever, and the length changing throttle orifice realizes.
5. the bidirectional control valve being applicable to short-wall coal-winning machine height-adjusting system according to claim 1, is characterized in that:
Described selector valve is composed in series by two two-position three-way valves and is subject to the oil pressure cntrol in adjust high cylinder two chamber, and when rocking arm rises, its oil return does not affect by the throttling of one-way throttle valve; When rocking arm declines, its oil return forms balanced loop by throttle valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310524907.3A CN103541942B (en) | 2013-10-29 | 2013-10-29 | Be applicable to the bidirectional control valve of short-wall coal-winning machine height-adjusting system |
Applications Claiming Priority (1)
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| CN201310524907.3A CN103541942B (en) | 2013-10-29 | 2013-10-29 | Be applicable to the bidirectional control valve of short-wall coal-winning machine height-adjusting system |
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| CN104196789B (en) * | 2014-07-10 | 2016-04-27 | 安徽省矿业机电装备有限责任公司 | A kind of equipment train Combined hydraulic valve system and controlling method thereof |
| CN109296582B (en) * | 2018-09-28 | 2020-09-08 | 北京全路通信信号研究设计院集团有限公司 | Bidirectional differential pressure control device, electro-hydraulic switch machine and bidirectional differential pressure control method |
| CN114779832B (en) * | 2022-03-04 | 2024-04-26 | 杭州诺祥科技有限公司 | Automatic tracking driving system for double-shaft solar panel |
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| SU1307055A2 (en) * | 1985-08-28 | 1987-04-30 | Научно-производственное объединение по созданию и выпуску средств автоматизации горных машин | Hydraulic drive for stepped motion of working member of mining machine |
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| CN202300389U (en) * | 2011-08-15 | 2012-07-04 | 三一重型装备有限公司 | Closed type height-adjusting system and coal mining machine |
| CN203548396U (en) * | 2013-10-29 | 2014-04-16 | 天地上海采掘装备科技有限公司 | Two-way control valve suitable for short-arm coal mining machine height-adjusting system |
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| SU883418A1 (en) * | 1972-07-14 | 1981-11-23 | Институт горного дела им.А.А.Скочинского | Device for automatic programme control of the working members of coal cutter-loader according to the bed gypsometry |
| SU1307055A2 (en) * | 1985-08-28 | 1987-04-30 | Научно-производственное объединение по созданию и выпуску средств автоматизации горных машин | Hydraulic drive for stepped motion of working member of mining machine |
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